EP0488058A1 - Formierzone in der Zweisiebenformierpartie einer Papiermaschine - Google Patents

Formierzone in der Zweisiebenformierpartie einer Papiermaschine Download PDF

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Publication number
EP0488058A1
EP0488058A1 EP91119880A EP91119880A EP0488058A1 EP 0488058 A1 EP0488058 A1 EP 0488058A1 EP 91119880 A EP91119880 A EP 91119880A EP 91119880 A EP91119880 A EP 91119880A EP 0488058 A1 EP0488058 A1 EP 0488058A1
Authority
EP
European Patent Office
Prior art keywords
forming
support members
gap
gap arrangement
wires
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91119880A
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English (en)
French (fr)
Inventor
Petri Nyberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Paper Machinery Inc
Original Assignee
Valmet Paper Machinery Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Valmet Paper Machinery Inc filed Critical Valmet Paper Machinery Inc
Publication of EP0488058A1 publication Critical patent/EP0488058A1/de
Withdrawn legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention concerns a forming-gap arrangement in a twin-wire former of a paper machine, which twin-wire former comprises forming wires operating one against the other, between which wires there is a twin-wire forming zone, on which dewatering and web-formation elements are provided and which forming wires define a wedge-shaped narrowing forming gap between them, into which the slice arrangement of the headbox of the paper machine is fitted to feed the pulp suspension jet from which the paper web is formed, and which said headbox comprises two lip walls placed one opposite the other, the discharge duct being placed between said lip walls, which duct preferably becomes narrower in the direction of flow of the pulp suspension so that, in the discharge duct, the flow speed of the pulp suspension is increased.
  • the pulp suspension jet is fed into a wedge-shaped, narrowing gap between the forming wires.
  • the pulp suspension jet is directed at an unsupported outer wire at a certain impingement angle.
  • a live pulp suspension jet produces instability in the unsupported wire, and above all transverse wrinkles, waves, and streaks in particular at the edges of the machine. Said tendency of formation of wrinkles and waves produces variation in grammage both in the machine direction and in the transverse direction in the finished paper or board.
  • the distance of flight of the pulp suspension jet departing from the headbox is a factor critical in many respects.
  • a relatively long distance of flight of the jet subjects the jet to effects of air flows in the gap, whereby the point of impingement of the jet may be changed and/or the surface of the jet may be disintegrated with resulting inferior formation and possibly deterioration of other properties of the paper.
  • a long distance of flight of the jet in absence of the turbulence arising from the differences in velocity produced by walls increases a renewed flocculation of fibres in a detrimental way.
  • US Pat. 3,619,362 is most closely related to the present invention, in which construction a lip part of a headbox and a related forming gap are described, the forming gap being defined between two forming rolls.
  • the walls of the headbox lip part are provided with extensions consisting of flexible lip plates, which are in contact with, and drag against, the forming rolls and the wires, which run over said rolls, within a remarkably large sector, and said flexible lip plates extend relatively deep into the forming gap over said contact sectors.
  • the object of the present invention is to provide a novel forming-gap arrangement for use in connection with a twin-wire former so that the drawbacks discussed above can be substantially avoided.
  • a non-indispensable additional object of the present invention is to provide a forming-gap arrangement that can be adjusted in a versatile way.
  • a non-indispensable additional object of the invention is to provide a forming-gap arrangement in connection with which it is advantageously possible to measure the dimensions of the forming gap and the pulp suspension jet in the direction of thickness and, if necessary, also the velocity of the pulp suspension, and in connection with which arrangement it is possible, based on these measured quantities, to carry out versatile adjustments of the lip part of the head box and possibly also other adjustments.
  • the invention is mainly characterized in that the forming-gap arrangement comprises two opposite support members, whose inner sides have been arranged as direct extensions of the inner sides of the lip walls that define the discharge duct, that said support members have been arranged to extend into the forming gap as substantially parallel to one another, so that the free ends of the support members are placed at direct proximity of, or in contact with, the forming wires, and that said support members are made of a plate-like, at least to some extent resilient material.
  • the pulp suspension jet is supported all the way to the wires by means of in such a way resilient support members that the members do not have to bear the forces arising from accelerating of the discharge jet.
  • the support members can be placed so that they start after or before the profile bar or an equivalent profile regulation equipment, so that the constructions placed against the support member behind said member bear the forces arising from accelerating of the flow.
  • the free outer ends of the support members are dimensioned preferably so that they drag against the wires in the forming gap, in which case it is also possible to regulate the magnitude of the back wave formed in the gap.
  • the point of impingement of the jet at the nip between the wire and the former roll is also adjusted.
  • the material of the support members must be, at the same time, both resilient and sufficiently rigid to prevent formation of detrimental extra oscillations.
  • a teflon-coated metal plate or fibre/composite structures can be concerned as support members.
  • Materials that are rigid anisotropically, in different ways in the machine direction and in the transverse direction, are also suitable for the purpose. If a member is sufficiently rigid in the machine direction, the transverse rigidity can be lowered to facilitate the adjustment.
  • Figure 1 is a schematic side view of an exemplifying embodiment of a gap former in which a forming-gap arrangement in accordance with the invention is applied.
  • Figure 2 is a schematic vertical sectional view in the machine direction of a gap arrangement in accordance with the invention and, at the same time, Fig. 2 is the detail D indicated in Fig. 1.
  • Figure 3 illustrates a second exemplifying embodiment of the invention in a way corresponding to Fig. 2.
  • Figure 4 is a schematic transverse sectional view along the line IV-IV in Fig. 2.
  • Fig. 1 is a schematic illustration of the invention as applied in connection with a gap former marketed by the applicant under the trade mark "Speed-Former HS".
  • the former comprises a carrying wire 10 and a covering wire 20, which define a twin-wire forming zone between the forming rolls 11 and 13.
  • the carrying wire 10 is guided by the forming roll 11,13 and by the guide rolls 14,15.
  • the twin-wire forming zone starts from the forming gap G defined by the wires 10 and 20 guided by the rolls 11 and 21, and the gap is followed by a forming shoe 22, which is provided with a curved face and is placed inside the loop of the covering wire 20, and thereupon by a foil arrangement 12 placed inside the loop of the carrying wire.
  • a forming shoe 22 which is provided with a curved face and is placed inside the loop of the covering wire 20, and thereupon by a foil arrangement 12 placed inside the loop of the carrying wire.
  • the second forming roll 13 and by the effect of the suction prevailing in the interior of said forming roll 13, the web W follows the carrying wire 10 and is separated from the covering wire 20.
  • the return run of the wire 20 is first guided by the leading roll 24a and then by the guide rolls 24.
  • the headbox 30 that is shown schematically in Fig. 1 comprises an inlet header 39, a distributor tube bank and a turbulence generator 38 as well as a discharge duct 32, from which the pulp suspension jet J is discharged into the forming gap G.
  • Fig. 1 The former shown in Fig. 1 is illustrated just as an example of the environment of application of the forming-gap arrangement in accordance with the invention, and it should be emphasized that the invention can be applied in connection with highly different gap formers, which formers differ essentially from that shown in Fig. 1.
  • a first exemplifying embodiment of a forming-gap arrangement in accordance with the invention is shown.
  • the wedge-shaped discharge duct 33 of the headbox is defined between the lip walls 31 and 32.
  • a pulp suspension flow F flows, in which a suitable state of turbulence has been produced in the preceding turbulence generator 38.
  • the pulp suspension flow F is accelerated to a suitable velocity in the narrowing discharge duct 33, which is provided with a discharge opening A.
  • the pulp suspension jet J is not allowed to be discharged into the forming gap G freely, but at both sides of the jet J, plate-shaped support members 40 and 41 are employed, which have plane smooth inner faces.
  • the material of the support members 40 and 41 is a resilient but sufficiently rigid plate material, which is made of metal sheets coated, e.g., with Teflon (TM) and/or of fibre/composite materials.
  • the support members 40 and 41 extend across the entire transverse width of the pulp jet J as unified plate constructions.
  • the support members 40,41 become preferably thinner towards their ends 42 in the flow direction F of the pulp suspension.
  • the support members 40 and 41 do not necessarily have to be made of a plate material of uniform strength and of one plate or of several layers, but in some cases the invention can be accomplished by using materials or wall constructions that have different rigidities in the machine direction and in the transverse direction. It is particularly advantageous to carry out the invention by means of a support member construction whose walls are substantially more rigid in the machine direction than in the transverse direction, which facilitates the profiling of the support plates for adjustment.
  • Such an anisotropy of rigidity can be produced, e.g., by means of various layer constructions, rib constructions, and/or grooves, the latter formations being placed on the outer faces of the support members.
  • the gap arrangement shown in Fig. 2 is also advantageous in the respect that, after the free ends 42 of the support members 40,41, the pulp suspension jet J enters between the wires 10,20 initially in an area where the wires are supported stably by the roll 11,21 faces 11',21', so that detrimental oscillations and other disturbance cannot be produced.
  • the gap is supported by the roll face 21' at the side of the wire 20.
  • the fibre orientation and the formation can also be affected in away in itself known by setting the velocity v0 of the pulp suspension jet discharged from between the ends 42 of the support members 40,41 at a suitable level in relation to the velocity v1 of the wires.
  • the difference in velocity v0-v1 could be used as one of the regulation parameters, it is, of course, required that the velocity v0 is known sufficiently precisely.
  • the measurement of the velocity v0 in connection with the invention will be returned to in more detail in connection with the description of Fig. 4.
  • the forming gap G is defined between the wires 10,20 that run overthe forming roll 11 and the leading roll 21.
  • the forming roll 11, over which the wire 10 runs, comprises a perforated mantle face 11'.
  • a suction zone 11a which is defined by the ribs 11b of the suction box, which ribs operate against the inner face of the cylinder mantle of the roll 11.
  • water is also removed into the suction box in the roll 11 in the direction of the arrows F1. Also, considerable dewatering takes place into the hollow face 21' of the roll 21 and through the wire 20 in the direction of the arrows F2.
  • the support members 40 and 41 are provided with fastening parts 43, by whose means the support members 40,41 are fixed across their entire width, one support member 40 to the lip wall 32 and the other support member 41 to the lip wall 31, to the grooves provided in said walls by means of the fastening parts 43.
  • the support members 40,41 are supported from outside by backup pieces 35 and 36, which are attached to the lip walls 31 and 32 by means of groove-projection fittings 37.
  • the upper support member 40 goes on as a plane plate part 40b made of one piece and, by means of a fold 40a, joining the plane part of the support member 40 that guides the discharge jet.
  • the smoothly curved fold 40a is placed at the level of the discharge opening A and regulates the magnitude of the discharge opening.
  • Fig. 3 shows a second exemplifying embodiment of the invention, wherein the support members 40 and 41 are attached to the front sides of the lip walls 31 and 33 by means of fastening parts 43.
  • the support members 40,41 do not participate in the profiling of the discharge opening A, but for that purpose the lip wall 31 is provided with a profile bar 34b, regulating spindles 34, and profile regulation motors 33.
  • the geometry of the forming gap G shown in Fig. 3 also differs to some extent from that shown in Fig. 2.
  • one support member 40 is also illustrated as operating as a member by whose means the profile of the discharge opening A is adjusted.
  • the invention can also be accomplished so that the stationary support member 41 shown in Fig. 2 is replaced by a second adjustable support member similar to the adjustable support member 40, in which case two opposite adjustable support members are used for the profiling of the discharge opening A, both of which are provided with profile regulation devices 33,34,34a.
  • Fig. 4 is a schematic transverse sectional view along the liner IV-IV in Fig. 2.
  • the series of regulation rods 34 are seen.
  • the regulation rods 34 are at a transverse distance L2 from one another.
  • electric motors 33 are connected, which receive their control signal c1...c N from the regulation system 53, which is illustrated just schematically.
  • the outer ends of the regulation rods 34 are connected to said flexible rib part 34a by the intermediate of connecting parts 34b, which rib part 34a acts upon the profile of the support member 40 and, thereby, upon the thickness profile h1...h n of the pulp suspension jet J in the way described above.
  • a series of detector pairs 51a,51b; 52a,52b is arranged in connection with the support member 40.
  • the distance between said detectors in the transverse direction is denoted with L1.
  • measurement signals a1,a2...b1,b2... are passed to the regulation system 53, by means of which signals the thickness profile h1,h2...h N of the discharge jet is measured.
  • Said detectors may be, e.g., contact detectors, capacitive detectors, ultrasonic detectors, or other, corresponding detectors.
  • measurement of the velocity v0 and of the velocity profile of the discharge jet can also be connected to the detectors 51,52.
  • ultrasonic detectors whose operation is based on the correlation technique.
  • Fig. 4 it is suggested that the regulation system 53 be connected with a block 54, which represents the entire measurement and control system of the paper machine, from which the series of signals S of the set values is received, by whose means the thickness profile of the discharge duct is set at a suitable value. It should be emphasized that, in Fig. 4, the regulation and measurement system is illustrated just quite schematically and by way of example, and many variations from Fig. 4 are possible.
  • the invention concerns a forming-gap arrangement in a twin-wire former of a paper machine.
  • the twin-wire former comprises forming wires (10,20) operating one against the other, which forming wires (10,20) define a wedge-shaped narrowing forming gap (G) between them.
  • the forming-gap arrangement comprises two opposite support members (40, 41), whose inner sides have been arranged as direct extensions of the inner sides of the lip walls (31,32) of the headbox that define the discharge duct.
  • the support members (40,41) have been arranged to extend into the forming gap (G) as parallel to one another, so that the free ends (42) of the support members (40,41) are placed at direct proximity of, or in contact with, the forming wires (10,20).
  • the support members (40,41) have a plate-like, isotropic or anisotropic, at least to some extent resilient construction.

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EP91119880A 1990-11-29 1991-11-21 Formierzone in der Zweisiebenformierpartie einer Papiermaschine Withdrawn EP0488058A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI905896 1990-11-29
FI905896A FI905896A (fi) 1990-11-29 1990-11-29 Formningsgapsarrangemang i en dubbelviraformare av en pappersmaskin.

Publications (1)

Publication Number Publication Date
EP0488058A1 true EP0488058A1 (de) 1992-06-03

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Application Number Title Priority Date Filing Date
EP91119880A Withdrawn EP0488058A1 (de) 1990-11-29 1991-11-21 Formierzone in der Zweisiebenformierpartie einer Papiermaschine

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EP (1) EP0488058A1 (de)
FI (1) FI905896A (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017644A1 (en) * 1991-04-08 1992-10-15 Scott Paper Company Method and apparatus for improved twin wire forming
EP0526259A1 (de) * 1991-06-21 1993-02-03 Kimberly-Clark Corporation Verlängerte, flexible Auslasslippe eines Stoffauflaufs
EP0711869A3 (de) * 1994-11-10 1997-04-16 Voith Sulzer Papiermasch Gmbh Mehrschichten-Stoffauflauf
WO1998003727A1 (en) * 1996-07-23 1998-01-29 Valmet Corporation Twin-wire gap former in a paper machine
WO1999040254A1 (de) * 1998-02-06 1999-08-12 Andritz-Patentverwaltungs-Gesellschaft Mbh Verfahren und vorrichtung zur formierung von faserplatten
DE19919720A1 (de) * 1999-04-30 2000-11-02 Voith Sulzer Papiertech Patent Blattbildungssystem
WO2001007711A1 (en) * 1999-07-22 2001-02-01 Metso Paper Inc. Method and apparatus for washing fibre pulp mixture
WO2002063097A2 (de) * 2001-01-18 2002-08-15 Voith Paper Patent Gmbh Former sowie stoffauflauf für einen solchen former
AP1300A (en) * 1997-10-17 2004-09-08 Eurogene Ltd The use of inhibitors of the renin-angiotensin system for the treatment of hypoxia or impaired metabolic function.
EP2092117A1 (de) * 2006-10-06 2009-08-26 Metso Paper, Inc. Dichtungselemente in einer zweisiebpapiermaschine
EP2025809A3 (de) * 2007-08-04 2012-10-31 Voith Patent GmbH Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1407606A (fr) * 1964-09-14 1965-07-30 Time Procédé et machine pour la fabrication du papier
GB1015841A (en) * 1964-07-17 1966-01-05 Paper Machine Components Inc Improvements in or relating to paper making machines
US3440136A (en) * 1965-12-16 1969-04-22 Kimberly Clark Co Papermaking apparatus including two wire sheet formers having means for air purging
GB1156171A (en) * 1965-04-08 1969-06-25 Kimberly Clark Co Papermaking Machine and Stock-Inlet Device for the same
FR2014192A1 (de) * 1968-06-25 1970-04-17 Beloit Corp
FR2339704A1 (fr) * 1976-01-27 1977-08-26 Escher Wyss Gmbh Dispositif d'arrivee de pate d'une machine a papier
US4574033A (en) * 1982-07-06 1986-03-04 Kmw Aktiebolag Method and apparatus for delivering a multilayer jet of stock to a forming surface in a papermaking machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1015841A (en) * 1964-07-17 1966-01-05 Paper Machine Components Inc Improvements in or relating to paper making machines
FR1407606A (fr) * 1964-09-14 1965-07-30 Time Procédé et machine pour la fabrication du papier
GB1156171A (en) * 1965-04-08 1969-06-25 Kimberly Clark Co Papermaking Machine and Stock-Inlet Device for the same
US3440136A (en) * 1965-12-16 1969-04-22 Kimberly Clark Co Papermaking apparatus including two wire sheet formers having means for air purging
FR2014192A1 (de) * 1968-06-25 1970-04-17 Beloit Corp
FR2339704A1 (fr) * 1976-01-27 1977-08-26 Escher Wyss Gmbh Dispositif d'arrivee de pate d'une machine a papier
US4574033A (en) * 1982-07-06 1986-03-04 Kmw Aktiebolag Method and apparatus for delivering a multilayer jet of stock to a forming surface in a papermaking machine

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992017644A1 (en) * 1991-04-08 1992-10-15 Scott Paper Company Method and apparatus for improved twin wire forming
EP0526259A1 (de) * 1991-06-21 1993-02-03 Kimberly-Clark Corporation Verlängerte, flexible Auslasslippe eines Stoffauflaufs
EP0711869A3 (de) * 1994-11-10 1997-04-16 Voith Sulzer Papiermasch Gmbh Mehrschichten-Stoffauflauf
WO1998003727A1 (en) * 1996-07-23 1998-01-29 Valmet Corporation Twin-wire gap former in a paper machine
US5766419A (en) * 1996-07-23 1998-06-16 Valmet Corporation Twin-wire gap former in a paper machine
AP1300A (en) * 1997-10-17 2004-09-08 Eurogene Ltd The use of inhibitors of the renin-angiotensin system for the treatment of hypoxia or impaired metabolic function.
WO1999040254A1 (de) * 1998-02-06 1999-08-12 Andritz-Patentverwaltungs-Gesellschaft Mbh Verfahren und vorrichtung zur formierung von faserplatten
DE19919720A1 (de) * 1999-04-30 2000-11-02 Voith Sulzer Papiertech Patent Blattbildungssystem
WO2001007711A1 (en) * 1999-07-22 2001-02-01 Metso Paper Inc. Method and apparatus for washing fibre pulp mixture
US6302996B1 (en) 1999-07-22 2001-10-16 Metso Paper, Inc. Method and apparatus for washing fiber pulp mixture
JP2003505611A (ja) * 1999-07-22 2003-02-12 メトソ ペーパ インコーポレイテッド 繊維パルプ混合物の洗浄方法および装置
WO2002063097A2 (de) * 2001-01-18 2002-08-15 Voith Paper Patent Gmbh Former sowie stoffauflauf für einen solchen former
WO2002063097A3 (de) * 2001-01-18 2003-02-20 Voith Paper Patent Gmbh Former sowie stoffauflauf für einen solchen former
EP2092117A1 (de) * 2006-10-06 2009-08-26 Metso Paper, Inc. Dichtungselemente in einer zweisiebpapiermaschine
EP2092117A4 (de) * 2006-10-06 2012-05-30 Metso Paper Inc Dichtungselemente in einer zweisiebpapiermaschine
EP2025809A3 (de) * 2007-08-04 2012-10-31 Voith Patent GmbH Verfahren zur Beeinflussung der Zweiseitigkeit der Layer Orientation und Stoffauflauf zur Durchführung des Verfahrens

Also Published As

Publication number Publication date
FI905896A (fi) 1992-05-30
FI905896A0 (fi) 1990-11-29

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